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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e3fb99077bb900f5bb1aa68a6575668d299aff1954863dc38cc1ebd9843ad7' 
  AND token = 'bW7TQXlpvqykFaTHzMVkqSDynMUSA+oGyfQb4ddTKv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}